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We discuss an algebra of open formulas, SOAF. The algebra is equipped with the operator mgi-o, which computes suprema of sets of open formulas, ordered according to a weak form of instance ordering. Rules to compute such points are provided. These rules supply a computation procedure to unify open formulas. Next, we consider an algebra of closed formulas, SCAF. It has an operator mgi-c, which computes...
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